The 47-year-old man who was stabbed in North Belfast last month has been named as Martin Gavin.
Police were called to a property in the Harcourt Drive area at around 6.15am on Friday, January 7, following reports of a stabbing.
Mr Gavin was taken to hospital but sadly died from his injuries on the morning of Sunday, February 6.
PSNI Detective Chief Inspector John Caldwell said: “Martin Gavin died as a result of injuries sustained on Friday 7 January. He had been stabbed.
“Police were called to a house in Harcourt Drive at around 6.15am that Friday. Mr Gavin was taken to hospital, but sadly passed away just over four weeks later, on the morning of Sunday February 6.
“A murder investigation has been launched, and I would reiterate our appeal to anyone with information to come forward.
"If you were in the Harcourt Drive area late on Thursday 6 January or early on Friday 7 January and noticed any suspicious activity, please contact us on 101 quoting reference number 188 07/01/22."
A report can also be made using the online reporting form via www.psni.police.uk/makeareport
Alternatively, information can be provided to Crimestoppers anonymously on 0800 555 111 or online at www.crimestoppers-uk.org